[masraum]

I don't know about that stuff myself, but the network at work uses NTP (Network Time Protocol) to keep the time on all computers and equipment in sync EXCEPT for the traders gear. The traders use PTP, precision time protocol.

Network Time Protocol - Wikipedia, the free encyclopedia - Precision Time Protocol - Wikipedia, the free encyclopedia

NTP can usually maintain time to within tens of milliseconds over the public Internet, and can achieve better than one millisecond accuracy in local area networks under ideal conditions.

(PTP) ... it achieves clock accuracy in the sub-microsecond range.

So, NTP can get you accurate to better than .001 sec
and PTP can get you accurate to better than .000001 sec